fix: prompt access control

src/lib/components/workspace/Prompts/PromptEditor.svelte

@@ -72,7 +72,7 @@
 			command = prompt.command.at(0) === '/' ? prompt.command.slice(1) : prompt.command;
 			content = prompt.content;
 
-			accessControl = prompt?.access_control ?? {};
+			accessControl = prompt?.access_control ?? null;
 		}
 	});
 </script>